Reference voltage generator and voltage generating system having the same

Abstract

A reference voltage generator includes a constant voltage generator suitable for using a high voltage as a first power supply voltage and for generating a constant voltage, and a first reference voltage generating unit suitable for using the constant voltage as a second power supply voltage and for generating a first reference voltage.

What is claimed is: 
     
         1 . A reference voltage generator, comprising:
 a constant voltage generator suitable for using a high voltage as a first power supply voltage and for generating a constant voltage; and   a first reference voltage generating unit suitable for using the constant voltage as a second power supply voltage and for generating a first reference voltage.   
     
     
         2 . The reference voltage generator of  claim 1 , wherein the constant voltage generator comprises a second reference voltage generating unit suitable for using the high voltage as the first power supply voltage and generating a second reference voltage; and a regulator suitable for using the high voltage as the first power supply voltage and generating the constant voltage by regulating the high voltage in response to the second reference voltage. 
     
     
         3 . The reference voltage generator of  claim 2 , wherein the first reference voltage generating unit and the second reference voltage generating unit are widlar type reference voltage generators. 
     
     
         4 . The reference voltage generator of  claim 2 , wherein the regulator comprises:
 a differential amplifier suitable for differentially receiving the second reference voltage and a divided voltage, and outputting a determination level to a current providing unit;   a voltage dividing unit suitable for outputting the divided voltage to the differential amplifier; and   the current providing unit suitable for outputting the constant voltage in response to the determination level of the differential amplifier,   wherein the divided voltage is a half voltage of the constant voltage.   
     
     
         5 . The reference voltage generator of  claim 4 , wherein the high voltage is a high voltage for a word line of a memory device. 
     
     
         6 . The reference voltage generator of  claim 5 , wherein the constant voltage generator and the first reference voltage generating unit includes an initial power supplier suitable for supplying an initial powe 
     
     
         7 . A reference voltage generator, comprising:
 a constant current generator suitable for using a high voltage as a first power supply voltage and generating a constant current; and   a first reference voltage generating unit suitable for using the constant current as a power source and generating a first reference voltage.   
     
     
         8 . The reference voltage generator of  claim 7 , wherein the constant current generator comprises a second reference voltage generating unit suitable for using a high voltage as a power supply voltage and generating a first reference voltage; and a current mirror unit suitable for generating a constant current in response to the first reference voltage. 
     
     
         9 . The reference voltage generator of  claim 8 , the first to reference voltage generating unit and the second reference voltage generating unit are threshold type reference voltage generators. 
     
     
         10 . The reference voltage generator of  claim 8 , wherein the high voltage is a high voltage for a word line of a memory chip. 
     
     
         11 . A voltage generating system, comprising:
 a reference voltage generator comprising:
 a constant voltage generator suitable for using a first high voltage as a first power supply voltage and generating a constant voltage; and a first reference voltage generating unit suitable for using the constant voltage as a second power supply voltage and generating a first reference voltage; and 
   a boosting unit suitable for generating a second high voltage in response to the first reference voltage and the second high voltage.   
     
     
         12 . The voltage generating system of  claim 11 , wherein the constant voltage generator comprises a second reference voltage generating unit suitable for using the high voltage as the first power supply voltage and generating a second reference voltage; and a regulator suitable for using the high voltage as the first power supply voltage and generating the constant voltage by regulating the high voltage in response to the second reference voltage. 
     
     
         13 . The voltage generating system of  claim 12 , wherein the first high voltage is substantially the same as the second high voltage. 
     
     
         14 . The voltage generating system of  claim 12 , wherein the first high voltage is supplied from an external device. 
     
     
         15 . The voltage generating system of  claim 14 , wherein the external device is a controller coupled to a memory device. 
     
     
         16 . The voltage generating system of  claim 14 , further comprising:
 a trimming circuit disposed between the reference voltage generator and the boosting unit, and suitable for generating reference voltages equal to or more than two reference voltages.   
     
     
         17 . A voltage generating system, comprising:
 a reference voltage generator comprising:
 a constant current generator suitable for using a first high voltage as a power supply voltage and generating a constant current; and a first reference voltage generating unit suitable for using the constant current as a power source and generating a first reference voltage; and 
   a boosting unit suitable for generating a second high voltage in response to the first reference voltage and the second high voltage.   
     
     
         18 . The voltage generating system of  claim 17 , wherein the first high voltage is substantially the same as the second high voltage. 
     
     
         19 . The voltage generating system of  claim 17 , wherein the first high voltage is supplied from an external device. 
     
     
         20 . The voltage generating system of  claim 19 , wherein the external device is a controller coupled to a memory device.